Back drilling threaded bit



FIG. 1 is a perspective view showing the design from the bottom, front and one side;

FIG. 2 is a front view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a back view thereof; and,

FIG. 6 is a left side view thereof, the right side being a mirror image of the left side. 

The ornamental design for a back drilling threaded bit, as shown and described. 